System for and method of assigning frequencies in a communications system with no central control of frequency allocation

• US 4,965,850 A
• Filed: 01/23/1989
• Issued: 10/23/1990
• Est. Priority Date: 01/23/1989
• Status: Expired due to Term

• Current Assignee: Wireless Spectrum Technologies Incorporated
• Original Assignee: Jerry R. Schloemer
• Inventors: Schloemer, Jerry R.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Kuntz, Curtis
• Application Number:
  US07/299,625
• Time in Patent Office: 638 Days
• Field of Search: 455/33, 455/34, 455/54, 455/56, 455/67, 379/59, 379/60, 379/63
• US Class Current: 455/450
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A system for and method of assigning frequencies in a mobile telephone communication system wherein there is no central control of frequency channel allocations and wherein such assignment is made by real time signal comparisons without reference to geographical patterns.

Claims

1. In a communication system comprising a plurality of base sites comprising transmitter and receiver means and a plurality of mobiles comprising transmitter and receiver units which can be selectively operated on a plurality of frequency channels, a method of making frequency channel assignment of said mobiles to said base sites by real time signal comparisons without reference to a geographical pattern and without use of a central frequency assignment control said method consisting of conducting the following tests before making a frequency channel assignment to a new, that is to be assigned, mobile:

a. determining whether signal transmissions from a new base site, that is the base site to which said new mobile is to be assigned will cause interference at a previously assigned mobile,

b. determining whether said new mobile will be interfered with by signal transmissions from a previously assigned base site,

c. determining whether said new base site will be interfered with by signal transmissions from a previously assigned mobile, and

d. determining whether signal transmissions from said new mobile causes interference at a previously assigned base site; and

, making said channel assignment.

2. A method as in claim 1 wherein said method consists of conducting at least three of the four determining steps recited in claim 1.

3. A method as in claim 1 wherein the real time signal comparison is of signal amplitudes.

4. A method as in claim 1 wherein communication between base sites pertaining to the assignment of channels is not required.

5. A communication system comprising

(a) a plurality of base sites comprising transmission and receiver means,

(b) a plurality of mobile transmission and receiver means which can be selectively operated on a plurality of frequency channels,

(c) means for making frequency channel assignment of said mobile means by real time signal comparisons of transmissions without reference to a geographical pattern, and without reference to a central frequency assignment control,

(d) means for determining whether the signal transmissions from a new base site, that is, a base site to which a new, that is a to be assigned mobile cause interference at a previously assigned mobile,

(e) means for determining whether said new mobile will be interfered with by signal transmissions from a previously assigned base site,

(f) means for determining whether said new base site will be interfered with by signal transmissions from a previously assigned mobile, and,

(g) means for determining whether said new mobile signal transmissions cause interference at a previously assigned base site.

6. A system as in claim 5 wherein said system comprises at least three of said recited means for determining an operating conditon.

7. A system as in claim 5 wherein the means for making the real time signal comparison comprises means for making a comparison of signal amplitudes.